build: rm global yarn cache (#6822)

* build: omit caching global modules

* docs: build omitting cache

.github/actions/setup/action.yml

@@ -10,7 +10,7 @@ runs:
       with:
         node-version: 18
         registry-url: https://registry.npmjs.org
-        cache: 'yarn'
+        # cache is intentionally omitted, as it is faster with yarn v1 to cache node_modules.
 
     - uses: actions/cache@v3
       id: install-cache